This reminds me of a Games for Windows article.
At the end of each magazine, two guys would compete against each other in various games. In this article, however, both of the regular writers were out and two substitute writers were used. The new guys decided to play Team Fortress Classic. The game type was the assault variant were you had to push a soccer ball into the other team's goal.
What these guys did was put themselves on the BLU team, have one person wait in the starting zone, get the ball back to their zone, then hold the starting zone door open and push the ball inside. In their words, "instant stalemate."
Now, the other team cannot get into their starting zone, so the ball is stuck there until one of their teammates can get it out. Friendly fire is off, however, so an ammo dispenser blocks one entrance while a sentry gun blocks the other. The entrance blocked by the sentry gun could only be accessed by going down a narrow hallway, which meant that getting close enough to destroy the gun was impossible. To make matters worse, the two new writers placed all kinds of annoying and insulting pictures on the walls of the hallway, so that the other team would constantly see them as they died.
What ended up happening was that RED and BLU teamed up against these two guys to get the ball out. At first, the medics of the RED team infected the BLU team, and then the infected BLU tried to get into their starting zone and infect the writers. This failed, but eventually, the BLU members died from the virus, respawned inside the starting zone, then pushed the two writers against the wall so that they could not move. This allowed RED to destroy the ammo dispenser and allow the ball to get out of the starting zone.
This was griefing, but like in this article, the other players came up with their own in-game solution to stop this. It can be funny, it seems, as long as people are able to stop you with in-game tools.